说明：  6种情况解三角形，包括各边，各角，面积，内切圆，外接圆，三高等三角形特征计算。并且可以输出计算过程。另外可以随机产生试卷和答案。
(6 kinds of cases solution triangle, including the edge, each Angle, area, multi-shaped rod regarding, inscribed circle, three higher triangle feature calculation. And can output calculation process. In addition to randomly generated test paper and the answer.)